I have and will..
hard to define "impossible to find single malt".. If it exists - you can probably find it, unless you have the last one..
But every malt in my rack is meant to be opened and drank and shared... do I have rare?... yes very.. Example, a 1906 Highland Park, I have never seen another, other than my bottle.. but it will be opened and shared...
What are the other options? Hold it and sell it? what is the point in that? Then I don't get to drink it.
Getting off my high horse.... Open and share